of acton vale



A. H. MIDGLEY.

COMBINED STARTER AND LIGHTING DYNAMO.

APPLICATION FILED JAN. 29, 1917.

Patented Dec. 23, 1919.

1 the circuit, preferably by being lifte Off U IT STATES PATENT OFFICE.

' ALBERT HENRY MIDGLEY, or ACTON VALE-ENGLAND, ASSIGNOR or ONEQHALF T00. A. vANDEnvELL & COMPANY LIMITED, or WARPLE WAY, ACTON ,VALE, ENGLAND.

COMBINED ST RTER AND LIGHTING-DYNAM Specification of Letterslatent.

' Patented Dec. 23, 1919.

To all whom it may concern:

Be it known that'I, ALBERT HENRY MIDG- LEY, a subject of the King ofGreat Britain and Ireland, and residing at Warple Way,

' 5 Acton Vale, in the county of Middlesex,

England, have invented certain new and useful Improvements in andRelating to Combined Starters and Lighting-Dynamos, of which thefollowingisa specification.

This invention relates to 'an improved -=combined starter and lightingdynamo, more particularly for use on motor vehicles, motor boats and thelike, andofthe type in which a single armature provided with onearmature Winding and one commutator only, is employed.

4 According to the present invention, thecombined starter and lightingdynamo,

cut-out inserted directly or' indirectly bea tween two brushes of thesame polarity, the

arrangement being such'that when the machine runs as, a dynamo one ofthe latter two brushes is electrically disconnected from the commutator,and the automatic cut-out is in action, being connected in the circuitthrough the otherbrush of thesame polar-.

ity,and that when the machine runs as a across the two brushes of thesame polarity so that no heavy starting current passesthrough it. a

With such an arrangement the advantage is attained .that the starterswitch which has to carry the heavy starting current may be entirelydispensed with, a further advantage being that the electricalconnections are be employed for I connecting the dynamo with thebattery. v V

- In carrying out the invention according to one form of construction,as illustrated Figure 1 of the accompanying drawing, the field magnet ofa four-pole machine s pro vided with a series and a shunt excitationwinding 1; and b res ectively, the positivepole of the batteryc eingconnected to one conunutatorbrush d and-the negative pole thereof beingconnected through the series field excitation winding a to a commutatorbrush 6 which is capableof being lifted off the commutator 7 whenrequired, and

which is provided with a series and a shunt field excitation winding,has the automatic motor the automatic cut-out is connected simplified inso far as only two cables needdiagrammatically and by way of example inI comprisinga field magnet, -a series field exthrough the automaticcut-out g to another commutator brush it, the two brushes 6 and it beingpreferably arranged diametrically opposite each other and at 90relatively to the brush (1 which is connected to the positive pole ofthe batte ry. In order to obtain a constant output one end of the shuntfield excitation winding 12 is connected to the positive brush 03 Whilethe other end thereof is connected to a brush 2' which is preferablyarranged betweenthe positive brush d and one of the negativebrushes,-preferably the movable negative brush 0.

When the machine hereinbefore referred to isrunning as a motor, themovable nega-' tive brush 6 rests on the commutator f, whereby theautomatic cut-out g is rendered inoperative and the. heavy startingcurrent ivsvprevented from passing through the same.

en the machine is running as a dynamo,

commutator, thereby leaving the automatic .cut-out in the circuitbetween the dynamo and the battery.

According to the modification illustrated in 2, one end of the automaticcut-out g is connected to a point between the batteryf 0' and the seriesfield winding (1 and through the latter indirectly to the removablecommutator brush e, While its other end is connected to anothercommutator brush h which is of the same polarity as the removable brushe. In this arrangement when the machine runs as a dynamo and the cut1-citation winding, a shunt field excitation winding, an armature, anarmature winding, a commutator, a source of electric energy, acommutator brush electrically connected with one pole of the source ofelectric energy, two brushes connected to the other pole of vthe sourceof electric energy,

an automatic cut-out in the connection between the latter pole and oneof the said two brushes connected thereto, the other one chine iscapable of being converted from a starter into a dynamo, merely by thesaid lifting off of one of the two brushes connected to one and the samepole of the source of electric energy, and from a dynamo into a startermerely by the replacing oi the said 10 brush on' the commutator, as andfor the purpose set forth.

In testimony whereof I have signed my name to this specification.

' ALBERT HENRY MIDGLEY.

